Check Engine LIgnt - Everyone's favorite

[bluepants42]

Greetings,

Quick question. I'm trying to work on a friends 00' corolla. If they disconnected the battery to temporarily "turn-off" the check engine light, will the code readers pick up any codes that existed before?

Or...do I have to wait for the light to come back on before checking the codes?

thanks people.

[ghost_ryder35]

try scanning it, but probally are going to have to wait. If the battery wasnt unhooked for a very long time the code may be dormant in their so you could still scan it.

[bluepants42]

I'll give it a try and let you know. thanks.

[DoubleEdgedWomb]

If you're doing this to try and pass a smog check, the testing device has a way to know if the computer has been cleared recently or not, and you'll still fail.

[bluepants42]

it's actually to look into a fuel pump issue...and perhaps other things...we'll see.

my friend did that for his car, and it passed smog....weird huh.

but thanks for the info.

[whatproblems]

yeah, i just recently unhooked my battery to mess with my intake, and when i put the battery in my check engine light was off, and has been for over a month, wonder if its gonna pick up though